Which of the following is a basic evolutionary advance needed to convert a down-like feather into a primary flight feather. a. The feathers rachis must be lengthened and reshaped to help support the birds weight
b. Down like feathers must become smaller in size
c. Down like feathers must grow out more quickly
d. Preening behavior must be eliminated from bird behavior
e. Adhesive proteins must be formed more quickly

what are the options?

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

the answer is otpion c) understanding

he wants to be heard one more time. he wants to be understood. he needs the truth one more time.

the animal that would be cutest if scaled down to the size of a cat? elephant